docs: def group(self, groupId):
          """
          The group's content provides access to the items that are shared
          with the group.
          Group items are stored by reference and are not physically stored
          in a group. Rather, they are stored as links to the original item
          in the item resource (/content/items/<itemId>).
          Available only to the users of the group and the administrator of
          the organization to which the group belongs, if any.
  
          Inputs:
             groupId - unique group identifier
          """
          url = self._url + "/groups/%s" % groupId
          return Group(groupId=groupId,
                        contentURL=url,
                        securityHandler=self._securityHandler,
                        proxy_url=self._proxy_url,
                        proxy_port=self._proxy_port)